An energy storage load following control architecture

Abstract

The utility model discloses a kind of energy storage load tracking control architecture, it is related to energy storage control technical field, comprising: alternating current incoming line side's current sampling sensor;Power electronic converter, with external current voltage sampling interface;The power electronic converter obtains the current signal of alternating current incoming line side in real time by the external current voltage sampling interface, and carries out real-time tracking control, realizes load tracking and prevents reverse flow function, the architecture is suitable for the multi-source fusion system including photovoltaic, charging pile, wind energy, diesel generator at least one, the system tracks single-phase and three-phase load change in the process of charging, discharging. The energy storage load tracking control architecture, by increasing current sampling sensor in alternating current incoming line side and increasing sampling interface for PCS, control function is decentralized to PCS, so that the dynamic response speed of system is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage control technology, specifically to an energy storage load tracking control architecture. Background Technology

[0002] With the rapid development of the energy storage and photovoltaic industries, the model of local consumption and self-consumption has become the mainstream trend in the industry. In energy storage application scenarios, how to make more rational and efficient use of battery energy, achieve accurate load tracking and reliable anti-reverse current function has become a key issue that needs to be solved.

[0003] Traditional control schemes involve sampling the input power using an AC incoming power meter and then transmitting the data to the control system via communication. The control system then regulates the charging and discharging of the internal power electronic devices to achieve reverse current prevention. However, this approach has several drawbacks: slow dynamic response speed, making it impossible to adjust the charging and discharging strategy in a timely manner when the load changes rapidly, resulting in low energy utilization efficiency; poor control precision, making it difficult to accurately match the battery charging and discharging power with the actual load demand, affecting system stability; and inability to effectively cope with complex scenarios where multiple loads change simultaneously, failing to fully leverage the advantages of the energy storage system. Utility Model Content

[0004] The purpose of this invention is to provide an energy storage load tracking control architecture to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an energy storage load tracking control architecture, comprising: a current sampling sensor on the AC incoming line side;

[0006] Power electronic converter with external current and voltage sampling interface;

[0007] The power electronic converter acquires the current signal from the AC input side in real time through the external current and voltage sampling interface and performs real-time tracking control to achieve load tracking and reverse current prevention functions.

[0008] Furthermore, the architecture is applicable to multi-source fusion systems that include at least one of photovoltaic, charging piles, wind power, and diesel generators.

[0009] Furthermore, the system tracks single-phase and three-phase load changes during the charging and discharging process.

[0010] Furthermore, it identifies diesel generator access in the absence of communication.

[0011] Furthermore, the power electronic converter executes the following control strategy based on the real-time sampled current signal:

[0012] a. When reverse current is detected, immediately adjust the charging and discharging power;

[0013] b. Adjust the charging and discharging status of the energy storage system in real time according to load changes.

[0014] This utility model provides an energy storage load tracking control architecture, which has the following beneficial effects:

[0015] 1. This utility model improves the dynamic response speed of the system by adding a current sampling sensor on the AC input side and adding a sampling interface to the PCS, thereby delegating the control function to the PCS.

[0016] 2. This utility model's load tracking system architecture is suitable for energy storage systems integrating multiple sources such as photovoltaics, charging piles, wind power, and diesel generators. Whether the load changes during charging or discharging (single-phase or three-phase), the system can achieve real-time and efficient tracking.

[0017] 3. This utility model has the function of identifying diesel generators without communication. Even without a complex communication network, the system can still accurately identify the working status of the diesel generator and perform corresponding control. Attached Figure Description

[0018] Figure 1 This is a flowchart of the energy storage load tracking control architecture of this utility model. Detailed Implementation

[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0020] like Figure 1 This embodiment of an energy storage load tracking control architecture adds a current sampling sensor (CT) to the AC incoming line side. A high-precision, wide-range Hall current sensor, such as the LEM LA-55P, is selected. An external current and voltage sampling interface is also configured for the PCS. The PCS acquires the AC current signal in real time through this interface and performs rapid response control accordingly, achieving load tracking and reverse current prevention functions. Based on the power requirements and application scenarios of the energy storage system, a suitable power electronic converter, such as an ABB ACS880 series inverter, is selected and modified to have an external current and voltage sampling interface. According to the equipment manual, the output signal line of the current sensor is connected to the external current sampling interface of the power electronic converter to ensure stable and reliable signal transmission.

[0021] The current sampling sensor monitors the AC incoming current in real time; the PCS acquires the current signal through an external interface; the PCS adjusts the charging and discharging power in real time according to the current signal; when reverse current is detected, the power output is immediately adjusted to prevent reverse current.

[0022] This system is suitable for systems utilizing multiple energy sources, including photovoltaics, charging piles, wind power, and diesel generators. It can identify diesel generator connections even without communication and automatically adjust control strategies. Based on site lighting conditions and power requirements, it installs an appropriate number and specifications of photovoltaic panels, connecting them to a photovoltaic inverter via DC cables. The inverter's AC output is then connected to the AC bus and works in conjunction with a power electronic converter. Depending on the usage scenario, AC or DC charging piles are selected and installed according to installation specifications. AC charging piles are directly connected to the AC bus; DC charging piles are connected to the DC bus via an internal power conversion module and communicate and coordinate with the power electronic converter. A wind turbine is installed, converting the AC power generated by the turbine to DC power via a rectifier, then connecting it to the DC bus via a DC-DC converter and electrically connecting it to the power electronic converter. A diesel generator of suitable power is selected and installed in a well-ventilated location away from flammable materials. The generator's output is connected to the AC bus, and necessary protection devices are configured to prevent backfeeding and overload.

[0023] In the control system of the power electronic converter, a dedicated data acquisition program is written to acquire the current signal from the external current and voltage sampling interface in real time. The program adopts an interrupt-driven approach to ensure timely response to changes in the current signal. The acquired current data is filtered to remove noise interference and improve the accuracy of the data.

[0024] Leveraging the powerful computing capabilities of microprocessors, rapid detection and processing of reverse current and load changes are achieved. For example, a reverse current threshold is set, and when the collected current value exceeds the threshold, a program module for adjusting the charging and discharging power is immediately triggered. A dynamic programming algorithm is used to optimize the charging and discharging state of the energy storage system based on real-time load changes to achieve the best energy utilization efficiency.

[0025] If there are devices in the system that require communication (such as some smart charging piles, photovoltaic inverters, etc.), develop corresponding communication programs and use common communication protocols such as Modbus and CAN to realize data interaction between the power electronic converter and other devices, which facilitates unified management and control.

[0026] When photovoltaic panels generate electricity, the photovoltaic inverter converts direct current (DC) to alternating current (AC) and injects it into the AC bus. The power electronic converter monitors the current signal on the AC input side in real time through an external current and voltage sampling interface. If reverse current is detected (i.e., excessive photovoltaic power is fed back to the grid), the charging and discharging power is immediately adjusted according to the control strategy, prioritizing the storage of excess photovoltaic power in the energy storage device. When the load changes, the charging and discharging state of the energy storage system is dynamically adjusted according to the real-time current signal. For example, when the electricity load increases and photovoltaic power is insufficient, the energy storage system increases the discharge power to meet the load demand together with the photovoltaic power; when the electricity load decreases and photovoltaic power is excessive, the energy storage system increases the charging power to store the excess power.

[0027] In charging pile connection scenarios, when a charging pile is connected to the system to charge an electric vehicle, the power electronic converter continuously monitors the current changes on the AC input side. During the charging process, if reverse current is detected (such as a charging pile malfunction causing current to flow in reverse), the charging and discharging power is quickly adjusted, and power supply to the charging pile is stopped to prevent damage to the power grid and equipment. Based on the single-phase or three-phase load changes during the charging process, the charging and discharging state of the energy storage system is adjusted in real time. For example, when multiple charging piles work simultaneously, causing an increase in load, the energy storage system promptly increases the discharge power to ensure a stable power supply to the charging piles. When the charging pile stops working or the charging current decreases, the energy storage system adjusts to a charging state to recover excess energy.

[0028] In wind energy integration scenarios, wind turbines convert wind energy into electrical energy, which is then rectified and converted before being connected to the DC bus. The power electronic converter monitors the current signal on the AC input side (indirectly reflecting the wind power generation status and the overall power balance of the system) to control the energy storage system. When unstable wind power generation causes reverse current (such as sudden changes in wind speed or excessive instantaneous power generation), the system quickly adjusts the charging and discharging power to store excess wind energy in the energy storage device. Based on changes in wind power generation and load, the system adjusts the charging and discharging state of the energy storage system in real time. For example, at night when the load is low but the wind is strong, the energy storage system increases the charging power to store excess wind energy; during peak electricity demand during the day and when wind is weak, the energy storage system increases the discharging power to supplement the power supply.

[0029] In the diesel generator connection scenario (without communication), the power electronic converter relies on real-time sampled current signals to identify the diesel generator connection. When the diesel generator starts and connects to the AC bus, the current signal changes significantly. A pre-set current characteristic recognition algorithm determines the connection status of the diesel generator. After connection, if reverse current is detected (e.g., the diesel generator output power exceeds the load demand), the charging and discharging power is adjusted promptly to store excess energy in the energy storage system. The charging and discharging state of the energy storage system is adjusted in real-time according to the diesel generator's operating status and load changes. For example, during diesel generator operation under load, when the load suddenly increases, the energy storage system rapidly increases its discharge power to assist the diesel generator in meeting the load demand; when the load decreases, the energy storage system adjusts to a charging state to recover excess energy.

[0030] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An energy storage load tracking control architecture, characterized in that, include: Current sampling sensor on the AC input side; Power electronic converter with external current and voltage sampling interface; The power electronic converter acquires the current signal from the AC input side in real time through the external current and voltage sampling interface and performs real-time tracking control to achieve load tracking and reverse current prevention functions.

2. The energy storage load tracking control architecture according to claim 1, characterized in that, The architecture is applicable to multi-source fusion systems that include at least one of photovoltaic, charging piles, wind power, and diesel generators.

3. The energy storage load tracking control architecture according to claim 2, characterized in that, The system tracks single-phase and three-phase load changes during charging and discharging processes.

4. The energy storage load tracking control architecture according to claim 3, characterized in that, Identify diesel generator access in the absence of communication.

Images